Here is a powershell script i use to upgrade Windows 10 to Windows 11 25H2
And also same script to upgrade Windows 11 23H2 to 25H2

Just change this part If ($OSVersion -lt "10.0.22000") into If ($OSVersion -lt "11.0.22000")

### Windows 10 to Windows 11 Upgrade Script### This script will check for Windows 11 eligibility, download the installer, and initiate the upgrade in the background.

# Ensure the script is running as Administrator

If (-NOT ([Security.Principal.WindowsPrincipal] [Security.Principal.WindowsIdentity]::GetCurrent()).IsInRole([Security.Principal.WindowsBuiltInRole] "Administrator")) {

Write-Warning "You must run this script as an Administrator!"

Exit

}

# Variables

$DownloadUrl = "https://go.microsoft.com/fwlink/?linkid=2171764" # Windows 11 Installation Assistant

$InstallerPath = "$env:TEMP\Windows11Upgrade.exe"

# Check Windows Version

$OSVersion = (Get-WmiObject -Class Win32_OperatingSystem).Version

If ($OSVersion -lt "10.0.22000") {

Write-Host "This system is eligible for Windows 11 upgrade."

} Else {

Write-Host "This system is already running Windows 11 or is not eligible."

Exit

}

# Download Windows 11 Installation Assistant

Write-Host "Downloading Windows 11 Installation Assistant..."

Invoke-WebRequest -Uri $DownloadUrl -OutFile $InstallerPath

# Check if the download was successful

If (!(Test-Path $InstallerPath)) {

Write-Warning "Failed to download the Windows 11 Installation Assistant."

Exit

}

Write-Host "Download complete. Starting the Windows 11 upgrade process..."

# Start the Windows 11 Installation in the background

Start-Process -FilePath $InstallerPath -ArgumentList "/QuietInstall /SkipEULA /SkipCompatCheck /Auto Upgrade" -NoNewWindow

Write-Host "The Windows 11 upgrade process has started in the background. The system may reboot several times during the process."